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feat: introduce strict eviction policy

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with strict eviction policy the descheduler only evict pods if the pod
contains a request for the given threshold. for example, if using a
threshold for an extended resource called `example.com/gpu` only pods
who request such a resource will be evicted.
This commit is contained in:
Ricardo Maraschini
2025-04-08 19:33:23 +02:00
parent cca28f7bbe
commit 35a7178df6
7 changed files with 149 additions and 6 deletions
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59
pkg/framework/plugins/nodeutilization/highnodeutilization_test.go
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@@ -48,6 +48,7 @@ func TestHighNodeUtilization(t *testing.T) {
testCases := []struct {
name string
thresholds api.ResourceThresholds
evictionModes []EvictionMode
nodes []*v1.Node
pods []*v1.Pod
expectedPodsEvicted uint
@@ -433,6 +434,53 @@ func TestHighNodeUtilization(t *testing.T) {
},
expectedPodsEvicted: 0,
},
{
name: "with extended resource threshold and no extended resource pods",
thresholds: api.ResourceThresholds{
extendedResource: 40,
},
evictionModes: []EvictionMode{EvictionModeOnlyThresholdingResources},
nodes: []*v1.Node{
test.BuildTestNode(n1NodeName, 4000, 3000, 10, func(node *v1.Node) {
test.SetNodeExtendedResource(node, extendedResource, 10)
}),
test.BuildTestNode(n2NodeName, 4000, 3000, 10, func(node *v1.Node) {
test.SetNodeExtendedResource(node, extendedResource, 10)
}),
test.BuildTestNode(n3NodeName, 4000, 3000, 10, func(node *v1.Node) {
test.SetNodeExtendedResource(node, extendedResource, 10)
}),
},
pods: []*v1.Pod{
// pods on node1 have the extended resource
// request set and they put the node in the
// over utilization range.
test.BuildTestPod("p1", 100, 0, n1NodeName, func(pod *v1.Pod) {
test.SetRSOwnerRef(pod)
test.SetPodExtendedResourceRequest(pod, extendedResource, 3)
}),
test.BuildTestPod("p2", 100, 0, n1NodeName, func(pod *v1.Pod) {
test.SetRSOwnerRef(pod)
test.SetPodExtendedResourceRequest(pod, extendedResource, 3)
}),
// pods in the other nodes must not be evicted
// because they do not have the extended
// resource defined in their requests.
test.BuildTestPod("p3", 500, 0, n2NodeName, func(pod *v1.Pod) {
test.SetRSOwnerRef(pod)
}),
test.BuildTestPod("p4", 500, 0, n2NodeName, func(pod *v1.Pod) {
test.SetRSOwnerRef(pod)
}),
test.BuildTestPod("p5", 500, 0, n2NodeName, func(pod *v1.Pod) {
test.SetRSOwnerRef(pod)
}),
test.BuildTestPod("p6", 500, 0, n2NodeName, func(pod *v1.Pod) {
test.SetRSOwnerRef(pod)
}),
},
expectedPodsEvicted: 0,
},
}
for _, testCase := range testCases {
@@ -474,10 +522,13 @@ func TestHighNodeUtilization(t *testing.T) {
})
}
plugin, err := NewHighNodeUtilization(&HighNodeUtilizationArgs{
Thresholds: testCase.thresholds,
},
handle)
plugin, err := NewHighNodeUtilization(
&HighNodeUtilizationArgs{
Thresholds: testCase.thresholds,
EvictionModes: testCase.evictionModes,
},
handle,
)
if err != nil {
t.Fatalf("Unable to initialize the plugin: %v", err)
}